Anomalous Nernst Effect in the Dirac Semimetal Cd3As2

Tian Liang, Jingjing Lin, Quinn Gibson, Tong Gao, Max Hirschberger, Minhao Liu, R. J. Cava, N. P. Ong

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Abstract

Dirac and Weyl semimetals display a host of novel properties. In Cd3As2, the Dirac nodes lead to a protection mechanism that strongly suppresses backscattering in a zero magnetic field, resulting in ultrahigh mobility (∼107 cm2 V-1 s-1). In an applied magnetic field, an anomalous Nernst effect is predicted to arise from the Berry curvature associated with the Weyl nodes. We report the observation of a large anomalous Nernst effect in Cd3As2. Both the anomalous Nernst signal and transport relaxation time τtr begin to increase rapidly at ∼50 K. This suggests a close relation between the protection mechanism and the anomalous Nernst effect. In a field, the quantum oscillations of bulk states display a beating effect, suggesting that the Dirac nodes split into Weyl states, allowing the Berry curvature to be observed as an anomalous Nernst effect.

Original languageEnglish (US)
Article number136601
JournalPhysical review letters
Volume118
Issue number13
DOIs
StatePublished - Mar 29 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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